A
What two muscle types are striated? Of those two, which has intercalated disc?
Skeletal muscle, Cardiac muscle(intercalated disc)
What are the connective tissue covering going most superficial to deep? What are the two deeper layers made up of?
Epimysium, Perimysium, Endomysium.
Perimysium and Endomysium are made of Collagen+elastic fibers
The _________ is the cell membrane of the muscle fiber. The _________ is the cytoplasm of the muscle fiber.
The Transmembrane Potential causes a _______ charge inside and a _______ charge outside.
negative, positive
What are the two functions of the Transverse tubules?
Carries action potential conducted by the sarcolemma, allows entire muscle fiber to contract simultaneously.
What are the two myofilaments? Which is thin and which is thick?
Actin-thin
Mysoin-thick
What two muscle types don't require nervous input and what is this called?
Cardiac and Smooth, Myogenic activity
The achilles tendon is known as what SPECIFIC connective tissue?
Aponeurosis
What element would be found more inside the cell and what element would we find more outside the cell?
K+ inside
Na outside
What is the functional unit of the skeletal system?
Sarcomere
What is the membranous structure surrounding each myofibril? What is stored inside of it?
Sarcoplasmic Reticulum
Ca2+
The Triad is made up of what structures? Where is the majority of Calcium stored?
1- T-tubule segment
Dark= ________ filaments and ______ bands
Light= ________ filaments and ______ bands
thick, A
thin, I
What represents the beginning/end of one Sarcomere?
Z-line
What will you find in the center of the A band? What would you find surrounding it? What is the correct terminology for the area where thin and thick filaments are on top of each other?
M line, H band(ONLY Thick filaments), Zone of overlap
What is the eleastic protein that prevents overstretching?
Titin
_____ filament is a twisted strand of ______ - _______ molecules
Thin, globular- actin
What is the protein complex that blocks the actin active site?
Troponin-tropomyosin
At rest, why can't Myosin grab onto Actin?
Because Tropomyosin is in the way.
What does Ca2+ bind to what to make it change its shape?
troponin
What are the six functions of the skeletal muscle tissue?
1. Produce skeletal movement
2. Maintain posture and body position
3. Support soft tissues
4. Guard entrances and exits(Sphincters)
5. Maintain body temperature
6. Store nutrient reserve
_______ filament is a twisted strand of "golf-club" shaped _______ molecules
Thick, myosin
What fits into the actin active site if unblocked? What does it make?
Myosin head, cross bridge
Towards contraction, the _______ head will swing towards the ______
Mysoin, M line
When the Myosin head is contracting, what does it release(specific)?
ADP and Inorganic Phosphate